Fig. 3From: SiO2 and TiO2 nanoparticles synergistically trigger macrophage inflammatory responsesCharacterization of SiO2 and TiO2 NP mixtures. a NPs were analyzed by transmission electron microscopy. b Hydrodynamic diameter and zeta-potential of NPs in PBS(−), PRMI-1640, or PBS(+) at pH7.2-7.4 were measured by dynamic light scattering. N.T.; not tested. Similar results were obtained in two independent experimentsBack to article page